Definition. A metric space is a set X together with a function d (called a metric or distance function) which assigns a real number d (x, y) to every pair x, y X satisfying the properties (or axioms): 1  d (x, y) 0 and d (x, y) = 0 x = y, 2  d (x, y) = d (y, x),
Here are some facts and guidelines about formaldehyde in plywood and OSB that can help you when building a chicken coop: 1  Formaldehyde is used in the binders and resins of some manufactured wood products. 2  Offgassing can be an issue with products containing urea-formaldehyde (UF) resins.
On the other hand, conventional homes with particleboard subflooring will have measured levels of formaldehyde in the range of 0.06 to 0.15 ppm with peak levels in the range of 0.10 - 0.15 ppm. It is the mobile home, however, that exposes its residents to the highest formaldehyde levels.